src/main/java/com/amazonaws/neptune/client/jena/NeptuneJenaSigV4Example.java [59:74]:
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                if (req instanceof HttpUriRequest) {

                    final HttpUriRequest httpUriReq = (HttpUriRequest) req;
                    try {
                        v4Signer.signRequest(httpUriReq);
                    } catch (NeptuneSigV4SignerException e) {
                        throw new HttpException("Problem signing the request: ", e);
                    }

                } else {

                    throw new HttpException("Not an HttpUriRequest"); // this should never happen
                }
            }

        }).build();
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src/main/java/com/amazonaws/neptune/client/rdf4j/NeptuneSparqlRepository.java [134:150]:
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                if (req instanceof HttpUriRequest) {

                    final HttpUriRequest httpUriReq = (HttpUriRequest) req;
                    try {
                        v4Signer.signRequest(httpUriReq);
                    } catch (NeptuneSigV4SignerException e) {
                        throw new HttpException("Problem signing the request: ", e);
                    }

                } else {

                    throw new HttpException("Not an HttpUriRequest"); // this should never happen

                }
            }

        }).build();
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